package com.ruoyi.web.controller.teaching.WebSocket;

import com.ruoyi.common.json.JSON;
import com.ruoyi.common.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;

/**
 * @author William
 */
@ServerEndpoint(value = "/api/websocket")
@Component
public class LessonWebSocket {
    protected final Logger logger = LoggerFactory.getLogger(this.getClass());
    /**
     * 静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
     */
    private static int onlineCount = 0;

    /**
     * concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
     */
    private static CopyOnWriteArraySet<LessonWebSocket> webSocketSet = new CopyOnWriteArraySet<LessonWebSocket>();

    /**
     * 与某个客户端的连接会话，需要通过它来给客户端发送数据
     */
    private Session session;

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session) {
        this.session = session;
//        ShiroUtils.getSysUser();
        //加入set中
        webSocketSet.add(this);
        //在线数加1
        addOnlineCount();
        System.out.println("有新连接加入！当前在线人数为" + getOnlineCount());
//        try {
//            sendMessage("8888");
//        } catch (IOException e) {
//            System.out.println("IO异常");
//        }
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        //从set中删除
        webSocketSet.remove(this);
        logger.info(this.toString());
        //在线数减1
        subOnlineCount();
        System.out.println("有一连接关闭！当前在线人数为" + getOnlineCount());
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        System.out.println("来自客户端的消息:" + message);
        //群发消息
        for (LessonWebSocket item : webSocketSet) {
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }


    @OnError
    public void onError(Session session, Throwable error) {
        System.out.println("发生错误");
        error.printStackTrace();
    }

    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
        //this.session.getAsyncRemote().sendText(message);
    }

    public static void sendInfo(String message) throws IOException {
        for (LessonWebSocket item : webSocketSet) {
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                continue;
            }
        }
    }

    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        LessonWebSocket.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        LessonWebSocket.onlineCount--;
    }
}
